Disinfection of effluents from municipal sewage treatment plants with peroxy acids.

摘要: Two peroxy acids, peracetic acid (PAA) and peroxy-monosulfuric or caro (CA) were tested as alternative bactericidal agents for the disinfection of effluents from municipal sewage treatment plants their action was compared with chlorine. PAA added in a concentration 2000 400 ppm, commonly used medicin, killed few minutes 99.9% more most bacteria (Fig. 1, A, B, C, D, E) excepted staphylococci micrococci (Fig F) endospores G). These effects comparable those obtained 5 ppm Although these results indicate very good killing effect, such concentrations are not applicable practice, they lowered pH increased BOD effluent. When smaller amounts (10 ppm) no change only negligible increase (Table 1) occured. contact time 15 min, gave reduction bacterial groups, varying between 96% (total count, Fig. 1 A) 100% (group-D streptococci, E). With slower, but after 30 similar to ppm. It also demonstrated that effect affected by number effluent before 2), well BOD. The addition inorganic CA high had disadvantageous on effluent, noted when it 10 In this concentration, times 120 min necessary kill about 90% showing weak disinfectant slow action. may be concluded could secondary degree purification.